Don't know which reticle you're talking about--the CQ one they advertise with the dots or the line mil reticle [i think it is].

When i use the line reticle systems i subtract one line thickness from the subtension that's supposed to be used as it's my opinion that most guys guess [interpolate] mil-readings from edge of line to edge of line so it's more accurate [i've found] to do that. Darrell Holland also suggests this.